On Some Properties of a Complete Quadrangle

Abstract

In this paper, we study the properties of a complete quadrangle in the Euclidean plane. The proofs are based on using rectangular coordinates symmetrically on four vertices and four parameters a,b,c,d. Here, many properties of the complete quadrangle known from earlier research are proved using the same method, and some new results are given.

Keywords

• complete quadrangle
• diagonal triangle
• anticenter